I started a running club.

This joke sprints to the finish line of humor with a classic case of wordplay and a delightful subversion of expectations. When you hear about someone starting a "running club," your brain naturally conjures images of people lacing up their sneakers, hitting the pavement, and enjoying the shared activity of running together. The punchline, "Everyone keeps running away," brilliantly twists the meaning of "running." Instead of participating in the club's intended activity, the members are literally fleeing from it, suggesting the club is so dreadful that desertion is the only option.

The comedic gold here comes from taking a common, positive real-world concept and turning it on its head. Running clubs are a staple in the sports world, offering community, motivation, and a shared passion for fitness. The joke plays on this familiar backdrop, setting up a scenario where the club's failure is so epic that its members are using the very act of running to escape. It's a simple, elegant piece of humor that relies on the dual meaning of a single word to deliver a laugh about a hilariously unsuccessful venture.